Move all node configuration to constructor

[lordjabez]

Due to an issue with CDK (aws/aws-cdk#18237) the permissions around the AwsCustomResource used to perform Hyperledger functions have to be broader than necessary, and not scoped to the constructs where they're used.

When the CDK bug is fixed, the code here can be cleaned up accordingly, see https://github.com/cdklabs/cdk-hyperledger-fabric-network/blob/main/src/network.ts#L353-L365. Specifically the nodes can completely set themselves up in their constructor and not require a subsequent call, and the permissions can be moved out of network.ts.